Concern # 1: the hose retracts when the jet is activated. So when you need to take advantage of its length, it quickly becomes unpleasant (the need to go back or take a break in order to find the required length).
Concern # 2: it also retracts when the jet stops (well OK, that's the principle). Yeah but actually it is very dangerous for him, if he is once again drawn on its entire length, or if it goes through a wall board => By retracting, big risks to hang something of rough / cutting. And that's probably as well as mine has pierced, and has therefore become unusable.
In the end, very disappointed with this purchase, I do not recommend it. I took over from a "traditional" pipe and it is much better!